<template>
    <div>
        <el-form
            v-loading.fullscreen.lock="loading"
            v-loading="loading"
            element-loading-text="正在登录..."
            ref="loginForm"
            :rules="rules"
            :model="loginForm"
            class="loginContainer">

            <h3 class="loginTitle">系统登录</h3>

            <el-form-item prop="username">
                <el-input type="text" v-model="loginForm.username" placeholder="请输入用户名"></el-input>
            </el-form-item>

            <el-form-item prop="password">
                <el-input type="password" v-model="loginForm.password" auto-complete="false" placeholder="请输入密码"></el-input>
            </el-form-item>

            <el-form-item prop="code">
                <el-input type="text" v-model="loginForm.code" auto-complete="false" placeholder="点击图片更换验证码" style="width: 250px;margin-right: 5px"></el-input>
                <img :src="captchaUrl" @click="updateCaptcha" alt="验证码">
            </el-form-item>

            <el-checkbox v-model="checked" class="loginRememberMe">记住我</el-checkbox>
            <el-button type="primary" style="width: 100%" @click="submitLogin">登录</el-button>
        </el-form>
    </div>
</template>

<script>

export default {
    name: "Login",
    data() {
        return {
           captchaUrl: '/captcha?time='+new Date(),
           loginForm: {
               username: 'admin',
               password: '123',
               code: ''
           },
           checked: false,
          loading: false,
           rules: {
                username: [{required:true, message:'请输入用户名', trigger:'blur'}],
                password: [{required:true, message:'请输入密码', trigger:'blur'}],
                code: [{required:true, message:'请输入验证码', trigger:'blur'}]
           }
        }
    },
    methods: {
      //登录处理
      submitLogin(){
        this.$refs.loginForm.validate((valid) => {
          if (valid) {
            //loading 效果
            this.loading = true
            //发送登录请求，传递数据
            this.postRequest('/login', this.loginForm).then(res => {
              //登录成功，跳转到主页
              if (res){
                this.loading = false
                //处理token
                const token = res.obj.tokenHead + res.obj.token

                //将token存入sessionStorage，配置给请求拦截器使用
                window.sessionStorage.setItem('token',token)

                //replace 点击浏览器返回不了上一页，push可以
                //根据用户输入地址跳转，不存在的路径或去往登录页就跳转到主页
                let path = this.$route.query.redirect
                this.$router.replace((path === '/' || path === undefined ? '/home' : path))
              }
              this.loading = false
            })
          } else {
            this.$message.error('请输入所有字段！');
            return false;
          }
        });
      },
      //更新验证码
      updateCaptcha(){
          this.captchaUrl = '/captcha?time='+new Date()
      }
    }
}
</script>

<style>
    .loginContainer {
        border-radius: 15px;
        background-clip: padding-box;
        margin: 100px auto;
        width: 350px;
        padding: 15px 35px 15px 35px;
        background: #fff;
        border: 1px solid #eaeaea;
        box-shadow: 0 0 25px #cac6c6;
    }
    .loginTitle {
        margin: 0 auto 40px auto;
        text-align: center;
    }
    .loginRememberMe {
        text-align: left;
        margin: 0 0 15px 8px;
    }
    .el-form-item__content {
      display: flex;
      align-items: center;
    }
</style>
